RU2409412C1 - Sleeve filter for three-stage air cleaning of mechanical impurities - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention is intended for cleaning aspiration air bled from woodworking grinding machines. Proposed filter comprises filtration modules with dust entrapping chambers, dusty air pipeline, collectors, filtration sleeves, bin, horizontal panel of ACF-type air cell-type filters, chambers of cleaned air and re-cleaned air, fans and circulation air duct. Cleaned air chamber accommodates T-line web with horizontal platform and vertical wall. Panel of filters is arranged on one side of said wall to make the chamber of air re-cleaning at the wall bottom and, at the wall top, to make re-cleaned air chamber. Crosswise web is arranged in the latter between horizontal platform and panel. Inspection ports are arranged ay inlet and outlet of additional dust entrapping chamber and re-cleaned air chamber and in crosswise web. Cleaned air discharge collector is arranged to embrace inspection ports. Circulation air duct incorporates T-tube with additional air duct communicated with filter bin opening. Additional and circulation air ducts are provided with controlled air shutters arranged in additional and circulation air ducts at T-tube outlets and dusty air feed pipeline.

EFFECT: reduced operating and repair costs, expanded operating performances.

12 dwg

Description

The invention is intended for the purification of gas and / or air in industrial premises, the equipment of which pollutes the air, in particular for the purification of aspiration air taken from woodworking grinding machines containing 100% wood grinding dust with solid abrasive particles, which is fire and explosion hazard, and return purified air to the production room. To obtain a higher technical result in comparison with the known solutions, namely, to reduce the operating costs for restoration repairs after explosions by eliminating the conditions for their formation and expanding the filter's functionality, T- was installed in the chamber of the cleaned air between the dust collecting chambers under the valve openings of the cleaned air a shaped partition having a horizontal platform and a vertical wall lowered downward, on one side of which with its connection to the end of the cell is equipped with a panel of air cell filters of the type ФЯК, equipped with wire frames, with the formation of an additional dust collection chamber from the bottom of the camera panel and placement of additional purified air on top of the camera panel, in which at least one transverse partition is installed between the horizontal platform and the panel of air cell filters dividing the panel into two sections, in addition, at the inlet and outlet of the chambers of additional dust collection and additionally purified air and in the transverse inspection hatches are installed in the partition, with openings with flanged nozzles to which controlled air dampers are attached, which additionally provide, together with the main centrifugal fan, the main and forced regeneration modes of the panel of air cell filters by back-flushing with cleaned air in the suction mode, while the collector for outputting additionally purified air installed covering inspection hatches with controlled air dampers located at the exit of the chambers additionally purified air and additional dust collection, the recirculation air duct is equipped with a tee with an additional air duct that is connected to the hole in the filter hopper, and controllable air dampers are installed in front of the filter on the additional and recirculation air ducts in front of the filter and in the contaminated air supply pipe in front of the filter contaminated purge air into the filter hopper and its supply to the filter bags in the suction mode by recirculation th circuit.

The claimed solution relates to the field of purification of air or gas, as well as mixtures thereof from mechanical impurities, in particular to the cleaning of aspiration air taken from woodworking grinding machines containing 100% wood grinding dust, which is fire and explosion hazard, and the return of purified air to production room.

The claimed solution can be used in milling, textile, chemical and other industries in which the suction air of production contains 100% fire and explosive dust such as wood grinding.

From the sources of scientific, technical and patent information, a large number of modifications of bag filters are known. Among them, those were selected in which the dust collecting chambers of the filter bags are installed in a row with the placement of a panel of air cell filters of the type ФЯК without regeneration between them, which makes it possible to further improve them in the direction indicated in the claims of the claimed solution.

Known filter C1, B01D 46/02, containing at least one row of filter modules, each of which has two dust collecting chambers installed with a gap between their side walls with sections of vertically arranged filter bags , collectors of variable cross-section for the input of contaminated and the output of purified air placed in the gap between the dust collecting chambers, a purge air collector, a main centrifugal valve a heater and a recirculation air duct with a tee connected to the discharge pipe of the main centrifugal fan, an additional centrifugal fan, the suction pipe of which is connected to a tee mounted on the discharge recirculation air duct of the main centrifugal fan, and the discharge pipe - with the inlet of the purge air manifold, louvres installed under each dust collecting chamber, valve boxes mounted on the dust grids evacuation chambers, with poppet type actuating valves located in them, interacting alternately with two coaxial openings located one on the purge and purified air collectors along their horizontal axis one above the other in each valve box, and two mirror-mounted valve boxes of one module have a common a partition dividing the pairs of their coaxial holes, a hopper with a discharge device for mechanical impurities of a conical-cylindrical shape. In addition, the filter contains at least one single-row panel of air cell filters located in the inlet of the confuser installed between the collectors of contaminated and purified air along the entire length of the row of modules and an additional collector of variable cross section, the inlet of which is connected to the outlet of the cleaned collector air, and the outlet of the confuser - with the suction pipe of the main centrifugal fan.

The filter is as follows.

Polluted air containing wood grinding dust from the collector for the input of polluted air of each row of modules enters the hoppers. The flow of contaminated air, enveloping the guiding shields, passes through the louvres, leaving wood dust in the bunker, then enters the filter sleeves and the panel of air cell filters of the type ФЯК, in which the air is cleaned of wood dust, the cleaned air is supplied by the main centrifugal fan to the recirculation duct . The filtering process in the sleeves is carried out during the estimated time, controlled by a time relay, after the operation of which an additional centrifugal fan is turned on and the process of sequential regeneration of the hose sections begins.

To regenerate the filtering fabric of the bags, the valve opening of the cleaned air of the regenerated bag section is closed and the valve hole of the purge air is opened. An additional centrifugal fan draws purified air from the tee mounted on the discharge recirculation air duct of the main centrifugal fan, and feeds it through the purge manifold and valve hole into the valve box of the regenerated hose section. In this case, the filter bags are blown in the opposite direction. Dust from the sleeves is discharged into the hopper part of the filter, and the polluted purge air enters the collector of polluted air and, passing through the louvred grilles, is distributed among the hose sections operating in the filtration mode, after which it is additionally cleaned in the panel of air cell filters of the type FJAK and enters main centrifugal fan.

The main centrifugal fan in filtration and regeneration modes has different performance. In regeneration mode, greater performance than in filtration mode, by the amount of performance of the additional centrifugal fan. The performance control of the main centrifugal fan during the transition from the filtration mode to the regeneration mode and, conversely, is carried out by means of a controlled throttle valve installed inside the recirculation duct.

The differences of the known filter are that on all the rods of the poppet type drive valves the upper and lower poppet valves are pivotally mounted, between which compression springs are placed. Slides in the form of a rectangular body are rigidly fixed on the rods, having guide and cantilever mounted rollers interacting with cams made with an internal concave working profile with a gap and rigidly mounted on the drive camshaft with a uniform angular displacement around the circumference relative to each other by an angle φ = ( 360 ° -α) / n, where α = 25 ... 30 ° is the angle of combination of regeneration cycles of adjacent hose sections, n is the number of hose sections. The hinges of the poppet valves are made in the form of ball bearings, in which the balls have through holes with rods movably mounted in them with the possibility of alternately lifting the upper and lower poppet valves.

The above bag filter has the following disadvantages:

1. It causes high operating costs for filter repair after explosions, which consist of replacing burnt filtering sleeves and air filter cells of the type ФЯК with new ones as a result of the absence of the regeneration system of the ФЯК panel and the accumulation of a large amount of wood grinding dust in it, as well as the occurrence of static electricity discharge which leads to an explosion.

2. Has limited functionality. The presence of a drive camshaft with cams for raising and lowering the rods of the drive valves, as well as the presence of a conical-cylindrical vane dust unloader in the filter limit the length of the filter and, as a result, limit its air performance.

The closest in technical essence and the achieved result is "C2 with priority from September 12, 2006, IPC B01D 46/02, which contains at least one row of filtering modules, each of which has two dust-collecting chambers installed with a gap between their side walls, equipped with tube sheets in the upper part with through pipes and sections of vertically arranged filter bags fixed to the top and open ends on the pipes of the tube sheets, a manifold of variable cross-section for introducing contaminated air, located in the interval between the dust collecting chambers, a manifold for purging air, a purge air manifold equipped with an inlet valve with a shut-off valve, a main centrifugal fan installed at the front end of each row of modules, and recirculation duct, valve boxes mounted on tube sheets with poppet type actuating valves located in them, interacting alternately with two coaxial openings for purge and purified air located on the horizontal axis of the purge air collector one above the other in each valve box, and two mirror-mounted valve boxes of one module have a common partition separating pairs of their coaxial openings, an airtight service chamber mounted on valve boxes, a hopper made of three parts, the upper of which is square, and the lower is cylindrical in shape, holes are provided in the upper part of the hopper I for entering contaminated air, equipped with guide shields and rotary dampers installed on the central partition dividing the hopper vertically, a louvred grille is inclined under each dust collecting chamber, and the lower cylindrical part of the hopper is made in the form of an annular groove with a hole for unloading mechanical impurities into the airlock unloader with the arrangement of lock unloaders in adjacent rows of modules in a staggered manner, above the trench along the axis of the cylindrical part, a drive conical-cylindrical unloading device with blades mounted radially on the outer surface of the cylindrical part and lowered into the groove, in addition, the filter contains at least one single-row panel of air cell filters, and the purge air manifold is equipped with an additional centrifugal fan, discharge pipe which is connected to the inlet of the purge manifold. The known filter differs in that the panel of air cell filters is installed horizontally in the gap between the dust collecting chambers under the valve openings for purified air to form an upper chamber of purified air, which is connected to the suction pipe of an additional centrifugal fan, and a lower chamber of additional purified air, made with one open end, to which a manifold of cleaned air outlet is attached, protruding beyond a number of modules and having two vertical side walls with rectangular windows, into which honeycomb lattices are built, made of flat and corrugated ribbons of heat-resistant material, having a total living area of corrugations, which prevents the passage of fire through them at an installed capacity of the main centrifugal fan, in addition to a cleaned output collector air at the outlet of the panels of fire barriers are connected to the receiving manifolds of variable cross section, the outlet openings of which are connected to the pipe collecting s Tee connected at the output with the main suction pipe of the centrifugal fan.

Despite the large number of coinciding features of the prototype and the proposed solution, the absence of the distinctive features of the latter in the prototype does not provide a technical result consisting in lowering operating costs for filter repair after dust explosions and expanding the filter's functionality for the following reasons.

1. The filter does not have a regeneration system for a panel of air cell filters of the type ФЯК, which causes the accumulation of a large amount of explosive wood dust in the panel of the ФЯК, which explodes when static electricity is generated or sparks break into the filter hopper. At the same time, not only air cell filters made of FNII-3 fabric are burned, but also filter bags. During the repair repair of the filter, the burnt filtering sleeves and air filter cells of the FCF are dismantled and replaced with new ones, which causes high operating costs.

2. The absence in the filter of the regeneration system of the PNF panel and the accumulation of a large amount of dust in it create conditions for the formation of a dust explosion in the filter, which requires the installation of fire barriers at the outlet of the filter, which limit the air filter performance, for example, with a sleeve length l = 4 m up to 15000 m ³ / h. Thus, the presence of fire barriers in the filter limits the functionality of the filter to increase its air performance.

The task to which the claimed solution is directed, consisted in further improving the known design of a bag filter with three-stage air purification from mechanical impurities, which include 100% wood grinding dust, and obtaining a technical result - reducing operating costs for filter repair after dust explosions and expanding the functionality of the filter by eliminating the conditions for their formation by creating a system of regeneration of the air panel GOVERNMENTAL PF of cellular type filters. The new FCN panel regeneration system, which is part of the proposed solution, is based on the method of reverse sectional purging of the FCF panel with cleaned air by the main centrifugal fan in the suction mode when the technological equipment is disconnected from the filter and was not previously used in the filtering technique for contaminated air flow.

The achievement of the above technical results is ensured by the fact that the bag filter for three-stage air purification from mechanical impurities, containing a series of filter modules, each of which has two dust collecting chambers installed with an interval between their side walls, equipped with perforated plates and sections of vertically arranged frame sections in the upper part filter bags fixed with open top ends on perforated plates, inlet duct for polluted air a, a collector for introducing contaminated air, at least a single-row and horizontally mounted panel of air cell filters of the FF type, a purge air collector, chambers of purified and additionally purified air, a main centrifugal fan and a recirculation duct, valve boxes mounted on perforated plates placed in them with poppet type actuating valves interacting alternately with two coaxial openings for purge and purified air located along the horizontal axis of the purge air manifold, one above the other in each valve box, and two mirror-mounted boxes of one module have a common partition separating pairs of their coaxial openings, a sealed service chamber mounted on the valve boxes, a hopper mounted under the dust collecting chambers and having an unloading device with gateway unloader, in addition, the filter contains an additional centrifugal fan, the suction pipe of which is connected by an air duct to the hole in the end cleaned air chamber, and a discharge pipe with an inlet of the purge manifold, and an additional cleaned air outlet manifold protruding outside the filter modules, connected at the outlet by an air duct to the suction pipe of the main centrifugal fan, characterized in that in the cleaned air chamber between the dust collecting chambers under the valve holes of purified air mounted T-shaped partition having a horizontal platform and a vertical wall lowered down, one at a time on the side from which, with the attachment to its free end, a panel of air cell filters of the type FAC equipped with wire frames is installed, with the formation of an additional dust collection chamber from the bottom of the camera panel and placement of additional purified air on top of the camera panel, in which is installed between the horizontal platform and the panel of air cell filters, at least one transverse partition dividing the panel into two sections, in addition at the inlet and outlet of additional dust collection chambers and additional of relatively cleaned air, inspection hatches are installed in the transverse partition with openings with flange nozzles to which controlled air dampers are attached, which additionally provide, together with the main centrifugal fan, the main and forced modes of regeneration of the panel of cell air filters by backwashing with cleaned air in the suction mode, this collector output additional purified air is installed with the coverage of inspection hatches with controlled air recirculation air duct is equipped with tees with an additional air duct that is connected to an opening in the filter hopper, and on the additional and recirculation air ducts at the exits of the tee, as well as on the polluted air inlet pipe in front of the filter, with recirculating air ducts located at the outlet of the chambers of additionally purified air and additional dust collection. controlled air dampers are installed, which ensure the return of contaminated purge air to the filter hopper and its supply to the filtering units Kava in recirculation mode suction mode.

The proof of the materiality of the differences and the relationship of the features with the achieved technical results are disclosed sequentially in the following order.

1. Reducing operating costs for filter repair after wood dust explosions in them.

2. Extension of filter functionality.

The reduction in operating costs for filter repair after wood dust explosions is carried out due to two technical solutions:

1) a T-shaped partition is installed in the chamber of cleaned air between the dust-collecting chambers under the valve openings of the cleaned air, having a horizontal platform and a vertical wall lowered downwards, on one side of which, with the connection to its free end, a panel of air cell filters of the type ФЯК equipped with wire frames, with the formation of the bottom of the camera panel additional dust collection and placement on top of the camera panel of additional purified air, in which between At least one transverse partition is installed on the platform and panel of air cell filters, in addition, inspection hatches are installed at the inlet and outlet of the additional dust collection chambers and additionally cleaned air and transverse partition have openings with flanged nozzles to which controlled air dampers are connected additionally providing, together with the main centrifugal fan, the main and forced modes of regeneration of the panel of cell air filters the backwash air purified in the suction mode;

2) the collector for the output of additionally purified air is installed with the coverage of inspection hatches with controlled air dampers located at the outlet of the chambers of additionally purified air and additional dust collection, the recirculation duct is equipped with a tee with an additional duct, which is connected to the hole in the filter hopper, and on the additional and recirculation the air ducts at the exits from the tee, as well as on the supply pipe of contaminated air in front of the filter are controlled air ear flaps.

The first technical solution forms an additional dust collection chamber from the bottom of the FFK panel and ensures the placement of an additional purified air chamber on top of the FFK panel. These cameras with their location, having a system of inspection hatches with 6 controlled air dampers installed inside the filter, allow you to:

- in the filtering mode of the FAC panel, the labyrinth passage of additionally cleaned air from the purified air chamber through the additional dust collection chamber and the FAC panel into the chamber of additional purified air and into the duct of the output of additional purified air;

- in the main mode of regeneration of the FCF panel, simultaneous purging of two sections of the FCF panel with cleaned air by the main centrifugal fan in the suction mode with the release of contaminated purge air outside the additional dust collection chamber, which ensures the minimum purge rate that is used when working on sanding dust of hardwood, for example birch trees;

- in the forced regeneration mode of the FCF panel, sequential blowing first of the section of the FCF panel located on one side of the transverse partition, and then the section of the FCF panel located on the other side of the transverse partition. The air flow rate during purging in the forced regeneration mode is 2 times higher than in the main regeneration mode. The forced regeneration mode is used when the filter operates on grinding dust of resinous coniferous wood species.

The second technical solution, which includes a system of 3 controlled dampers installed on air ducts outside the filter, ensures the return of contaminated purge air to the filter hopper and its supply to the filter bags in the suction mode according to the recirculation circuit.

Both technical solutions form a new system of regeneration of air cell filters of the type FYAK, which does not allow wood dust to accumulate in the FYAK panel in large quantities.

The new FCN panel regeneration system in combination with filtering sleeves sewn from glazed polyester, which does not hold the dust layer on its surface (are not included in the claimed solution), create conditions in which the concentration of dust in the air flow in the inlet transport pipe and in the filter In all modes of filtration and regeneration, C _H will be significantly less than the lower concentration limit of its ignition of the NKPV, at which an explosion is possible, i.e. With _N <NKPV = 12.6 g / m ³ (for wood grinding dust).

For example, take the dusty air mixture from a 6-spindle grinding machine of the Steinemann Nova-H16RFG brand, which is widely used in plywood production (M _P = 520 kg / h, L = 68000 m ³ / h). The air filter performance at an air suction coefficient of K _P = 1.1 through the leakage of the transport pipeline will be L _AC = K _p L = 1.1 · 68000 = 74800 m ³ / h. The concentration of dust in the transport pipe and inlet filter sleeves amount C _H = M _n × 10 ³ / L _AC = 520 × 10 ^3/74800 = 6.95 g / ^m3 <12.6 g / m ^3.

From the above example it follows that even with the maximum possible amount of dust removed, the concentration of the dusty air mixture in the inlet transport pipe and in the filtration mode does not reach LEL = 12.6 g / m ³ , at which an explosion is possible. Therefore, the dusty air mixture of wood dust in the transport pipeline leading to the filter and in the filtering mode is not explosive. In the regeneration mode of filter bags sewn from glazed polyester, for example, PE-340 (BWF, Germany), the dust concentration in the purge air is lower than in the filtration mode, because there is no dust layer on the surface of the regenerated tissue. During normal operation of the regeneration system of the panel of air cell filters, the condition С _Н <НКПВ = 12.6 g / m ^{3 is} also satisfied. Thus, the new system of regeneration of the panel of air cell filters eliminates the conditions for the formation of dust explosions in the panel of the nuclear fuel cell. The fulfillment of the condition С _Н <НКПВ = 12.6 g / m ³ (for wood grinding dust) ensures the operation of the filter in all its modes (filtration and regeneration) without dust explosions. The absence of dust explosions eliminates filter repairs and, as a result, reduces operating costs.

The calculation of the reduction in operating costs for reconditioning after dust explosions in the base filter (prototype) from the use of the proposed filter (the claimed technical solution), in which these explosions are eliminated, is given in the following example.

Example. The filter with the FCN type air cell filter regeneration system described in the claimed solution serves the Steinemann-NOVA-H16RFG brand grinding machine installed in the plywood grinding workshop and has an air capacity L _AC = 1.1 · 68000 = 74800 m ³ / h . The filter has a specific air load of V _beats = 120 m ³ / m ² h, according to which the total filtering surface area of the bags is F _fp = L _AC / V _beats = 74800 / 120≈625 m ² . In view of the joints in the arms of the total consumption of fabric on the sleeves will make F _Σ = K _Swiss F _FP = 1,15 · 625≈719 m ^2. As filter material, the calculation used polyester article 6500 (LLC Albokos, Chelyabinsk). According to Albokos LLC, the price of a set of sleeves with F _Σ = 719 m ² without VAT is 90 thousand rubles, and with VAT = 18%, respectively, C _k.r = 1.18 · 90 = 106.2 thousand rubles. Pocket air filters of class F7 (EU7) index 7670 with a mesh size of 500 × 500 × 600 mm were used as air cell filters. According to the data of Moven OJSC (Moscow), the price of one filter of the FAC of the specified index excluding VAT is 1280 rubles, and with VAT = 18%, respectively, C _fak = 1.18 · 1280 = 1510.4 rubles. The number of installed filters in the panel ≈ 30 pcs. The life cycle of the filter with three-stage air purification is assumed to be 8 years, and the percentage of risk according to the criterion of explosions is Pr = 11%. The number of explosions over 8 years in accordance with a risk percentage of 11% is 4. After each dust explosion in the filter, a set of filter bags and a set of FAC installed in the panel are replaced. The number spent as a result of four explosions of the filter prototype sets is:

- filter bags n _k = 4;

- filters FJK n _to = 4.

The cost of charred sets of filter bags for the life cycle of the filter prototype, taking into account the percentage of the cost of installation work, is 20%.

With _f.p. = n _to C _k.p. · K _M = 4 · 106.2 · 1.2 = 509.76 thousand rubles.

The number of burnt filters FJK for the life cycle of the filter prototype

n _Σ = n _to · n _phak = 4 · 30 = 120 pcs.

The cost of sets of burnt filters FJAK for the life cycle of the filter prototype, taking into account the percentage of the cost of installation work 20%.

C _phak = n _Σ C _phak K _M = 120 · 1510.4 · 1.2 = 217.4 thousand rubles.

Reduced operating costs from the use of the filter, made by the claimed solution, will be:

E _Z.R. = C _fr.r + C _fak = 509.76 + 217.4 = 727 thousand rubles.

The functionality of the filter is expanded by eliminating the conditions for the formation of dust explosions in the filter, which allows the filter to be made without fire barriers installed in the prototype at the outlet of the filter and limiting the filter performance with the length of the sleeves, for example, l = 4 m to 15000 m ³ / hours As a result, it is possible to create a filter with increased air capacity, for example, for servicing a Steinemann NOVA-H16RFG grinding machine with a filter capacity of L = 75,000 m ³ / h.

The elimination of conditions for the formation of wood dust explosions in the filters is carried out by creating a regeneration system for the FFK panel, provided by the two technical solutions described above.

An increase in the filter capacity L from 15,000 to 75,000 m ³ / h will allow a 5-fold reduction in the number of: main and additional centrifugal fans, dust unloading devices, sluice unloaders, recirculating air ducts with air detectors, as well as spark detection and spark extinguishing systems, dust prevention systems in the bunker parts of the filter, dust ignition and fire extinguishing detection systems and fire retention systems in the event of a fire in the filter to prevent fire from entering the air aspredelitel that reduce filter costs and increase reliability.

The design of the inventive bag filter is illustrated by the drawings in figures 1-12.

Figure 1 shows a bag filter in plan, composed of one row of filter modules (section KK in Fig. 8) in cooperation with a closed scraper chain conveyor of a closed type for moving solids from the filter to the storage bunker. Figure 2 is a section aa (figure 1) of the sleeve sections, the right of which in the purge mode. Figure 3 is a transverse section bB of the filter sleeve in purge mode (figure 2); figure 4 is a section bb (figure 1) of a single-row panel of air cell filters of the type FYAK (FAK - cell air filter pocket class F7 (EU7)); in Fig.5 is a section GG (in Fig.1) of the sleeve sections, the left of which is in the filtration mode, the sealed service chamber is not shown in the filtration mode (in Fig.5); figure 6 is a transverse section DD filter sleeve in filtering mode (figure 5); Fig.7 is a longitudinal section EE of the filter sleeve with a core frame (Fig.5); in Fig.8 is a section FJ on the central axis of a number of modules with a single-row panel of air cell filters of the type FJAK in the filtering mode (Fig.1); Fig.9 is a view A (Fig.8); figure 10 is a section ZZ (figure 8); 11 is a diagram of a spark detection and suppression system in the inlet transport pipe of polluted air; on Fig - section II of the inspection hatch with a controlled air damper in its open position on the horizontal panel.

The filter 1 (Fig. 1) is composed of one row of filtering modules 2 (Fig. 2), which is equipped with an inlet transport pipe for polluted air 3, a collector for inputting polluted air 4 with an upper inlet, a deflecting gable screen 5, and guide shields 6 in the lower part of the collector 4 (FIGS. 8, 10) of at least a single-row and horizontally placed panel 7 of air cell filters of the FF type, a purge air collector 8, cleaned chambers 9 and an additional 10 purified air, the main centrifugal fan 11, an additional centrifugal fan 38 for servicing the purge air manifold 8 and a recirculation duct 12 with an air distributor 13. The number of air intake manifolds 4 depends on the filter performance. In the filter for servicing one Steinemann-NOVA-H16RFG grinding machine, used for grinding plywood, two collectors 4 are installed.

Each of the filter modules 2 (FIGS. 2, 5) contains two dust collecting chambers 14, 15, a pair of poppet type valves 16 (FIG. 2), mounted on the rods 17 of the actuators 18, as well as two pairs of coaxial valve openings for the purge 19 and purified air 20, made under the valves 16 and located one above the other along the axis of the purge air collector 8. Each dust chamber 14, 15 has a perforated plate 21 with holes 22 installed in the upper part of the chamber, section 23 (figure 2) of vertically arranged filter hands Islands 24, open ends fixed in holes 22 of the perforated plate 21 by a double spring snap rings 25 sewn in the cuff arms 24 (Figure 7). In the filtering sleeves 24, rod frames 26 are installed in the form of vertical lateral rods 27 connected in height by several cross pieces 28. The collector 4 for introducing contaminated air acts as a dust collecting chamber, and the deflecting gable screen 5 with guiding shields 6 (Figs. 8, 10) are divided the incoming flow of polluted air into two parts and direct them into the dust collecting chambers 14, 15 (Fig.2, 5). Under the dust collecting chambers 14, 15, a hopper 29 with inclined walls, a flat bottom 30 and an unloading hole for removing trapped dust, equipped with a controlled shutter damper 31 and a flange pipe for attaching the sluice unloader 32 is installed. In addition, the valve 16 of each dust collecting chamber is enclosed in a valve box 33, two mirrored boxes have a common wall 34 separating a pair of coaxial holes 19, 20; valve boxes 33 with their open part are placed on perforated plates 21 and provided with inspection hatches 35, and valve boxes have a sealed service chamber 36 (Fig. 2). The hopper 29 in the lower part is equipped with an unloading device 37 in the form of a scraper chain conveyor transporting the captured dust to the discharge opening with a gate 31 of the hopper 29. In addition, the filter contains an additional centrifugal fan 38, the suction pipe of which is connected by an air duct 39 to the hole 40 in the end of the purified air chamber 9, and a discharge pipe with an inlet 41 of a purge air manifold 8, and an output manifold of additionally purified air 42, extending beyond the filter modules 2, are connected installed at the outlet by the duct 43 with the suction pipe of the main centrifugal fan 11. The cleaned air chamber 9 is equipped with an inspection door 44 installed in one of the ends of the chamber 9. In the cleaned air chamber 9 between the dust collection chambers 14, 15 at a distance of at least 2 m from the valve openings of purified air 20, a T-shaped partition 45 is installed, having a horizontal platform 46 and a vertical wall 47 lowered down, on one side of which, with the connection to its free end, an air panel 7 is installed x cell filters of the type ФЯК, equipped with wire frames 48, with the formation of the bottom of the panel 7 of the chamber for additional dust collection 49 and the placement on top of the panel 7 of the chamber of additional purified air 10, in which at least one transverse partition is installed between the horizontal platform 46 and the panel 7 of air cell filters fifty.

In addition, on the horizontal platform 46, on both sides of the vertical wall 47, at the ends of the chambers of additional dust collection 49 and additionally purified air 10, inspection hatches 51 are installed at the exit of the chambers 49, 10, as well as in the transverse partition 50, having openings 52 with flanged nozzles to which controlled air dampers 53, 54, 55, 56, 57, 58 are connected, which additionally provide, together with the main centrifugal fan 11, the main and forced modes of regeneration of the panel 7 m of its reverse purge with purified air in the suction mode. At the same time, the collector for outputting additionally purified air 42 is installed with the coverage of inspection hatches 51 with controlled air dampers 56, 57 located at the outlet of the chambers of additionally purified air 10 and additional dust collection 49, the recirculation duct 12 is equipped with a tee 59 with an additional duct 60, which is connected to hole 61 in the hopper 29 of the filter 1, and on the additional duct 60 and the recirculation duct 12 at the exits from the tee 59, as well as on the supply pipe of polluted air 3 Before filter 1 set controlled dampers 62, 63, 64, ensure return of contaminated air into the purge bin 29 January filter and its supply to the filter bags 24 in the suction mode by recirculating circuit.

The recirculation duct 12 and the purge air manifold 8 are equipped with throttles 65, 66 for outputting the main 11 and an additional 38 centrifugal fans to the design modes. To ensure fire safety, the filter is equipped with:

- a spark detection and suppression system installed on the inlet transport pipe 3 of polluted air;

- filter grounding system;

- a system for preventing dust accumulation in the bunker part of the filter;

- a system for detecting dust fire in the filter and fire fighting;

- fire retention system in the event of a fire in the filter to prevent the ingress of fire into the air distributor 13, installed in the workshop, and in the inlet transport pipe 3.

The following are installed in the spark detection and suppression system: at the beginning of the supply pipe 3, an optical flame detector 67 with a signal amplifier 68, and at the end of the pipe 3, a spark arrestor 69 in the pipe, which, according to the book by A.Ya. Korolchenko (“Fire and explosion hazard of industrial dust” Moscow: Chemistry, 1986) consists of a cylinder with a fire extinguishing agent 70 such as ammonium phosphate, a controlled valve 71 and a nozzle 72. A shut-off valve 73 is installed in front of the filter in the pipeline, connected to a signal amplifier 68 and designed to cut off fire from the filter. Under spark arrester 69 in the inlet transport pipe 3 there is an inspection hatch 74 to eliminate the effects of fire. The grounding system (not shown in the drawing) is a steel grounded rods installed next to the filter and connected to the filter housing.

The dust accumulation prevention system in the hopper part of the filter is based on turning off the main centrifugal fan 11 in case of failure of the scraper chain conveyor 37 and (or) the gate unloader 32 and is a system of electrical interlocks for the electric motors of the drive of the scraper chain conveyor 37 and the gate unloader 32, as well as a control sensor open circuit or its jump from the sprockets (not shown in the drawing), with the electric drive motor of the main centrifugal fan 11. These electrical interlocks about provide shutdown of the main centrifugal fan 11 in case of failure of the scraper chain conveyor 37 and (or) the gate unloader 32.

The system for detecting dust ignition in the filter and fire extinguishing (Fig. 1) contains fire sensors 75 installed in each dust collecting chamber 14, 15 and in the chamber for additional dust collection 49, a shut-off valve 73 installed in the inlet transport pipe, a shut-off valve 78, which are activated when triggered any of the sensors 75, manifolds with nozzles 76 for supplying water, communicating with fittings 77 mounted on the filter and controlled by shut-off valves 78 that open when the corresponding sensor 75 is triggered. Bottom b the unker 29 of the filter and the bottom of the chamber for additional dust collection 49 are equipped with drain holes and shut-off valves for draining water after fire fighting (not shown in the drawing).

The fire retention system in the event of a fire consists of fire retardant valves 79 and 80 installed on the recirculation duct at the outlet of the tee 81 connected to the vertical section of the recirculation duct 12. The fire retardant valve 79 is normally open and the valve 80 is normally closed. At the outlet of the valve 80, a square tap 82 is installed, turned down by an open hole 83, communicating with the atmosphere. In the event of a fire, the fire retardant valve 79 closes and the valve 80 opens, allowing air to escape from the filter by the fan 11 through the opening 83 of the exhaust 82 into the atmosphere.

In the claimed solution, under normal operating conditions, the conditions for the formation of an explosion are eliminated and the explosion of dust is impossible.

Abnormal operating conditions include dust accumulation in the filter hopper. But this situation is also impossible, because The filter is equipped with a dust prevention system in the filter hopper. In order to avoid explosion of the entire filter system in case of dust explosion, which is possible in case of failure of the dust prevention system in the filter hopper, i.e. in case of failure and filter operation in an emergency, the side walls of the dust collecting chambers 14, 15 are equipped with explosion dampers in the form of safety doors 84, each of which has a calibrated stop with a deep notch weakening its cross section. The strength of the dangerous section at the notch is calculated on the explosion pressure equal to 7 kPa, the excess of which ensures the destruction of the section, opening the doors and automatic release of the dust and gas mixture from the filter through the formed openings.

For servicing the actuators of the air dampers 56 and 57, the air duct for outputting additionally purified air 42 is equipped with inspection hatches 85.

The wood grinding dust trapped in the filter is discharged from the filter through the gateway unloader 32 into a closed scraper conveyor 86 of the closed type, which transfers the dust to the storage hopper 87 equipped with a fire extinguishing system (not shown in the drawing). A bag filter, consisting of one row of filtering modules, can operate in four modes:

1. all sections 23 of the filtering sleeves 24 operate in the filtering mode;

2. one of the sections 23 of the filter bags is in the regeneration mode (reverse purging of the bag section with purified air), and the remaining sections are in the filter mode;

3. the entire panel of air cell filters is in the regeneration mode, reverse purging with cleaned air by the main centrifugal fan 11 in the suction mode (main regeneration mode);

4. in the regeneration mode, first one half of the air cell filters are sequentially in the beginning, and then the second half (forced regeneration mode).

In addition, the filter has three emergency modes:

5. mode of spark detection and spark suppression in the inlet transport pipe 3;

6. dust ignition mode in the filter hopper 29;

7. The mode of dust explosion that can occur as a result of a failure of the system for preventing dust accumulation in the filter hopper and the discharge of static electricity.

The filter in the filtering mode (figure 5) works as follows. Contaminated air containing wood grinding dust and to be cleaned from the inlet transport pipe 3 enters the upper part of the collector 4 for the input of contaminated air. The air flow drops down, meeting in its way a deflecting gable screen 5 with guide shields 6, which divide the stream of polluted air into 2 parts. The resulting two streams of contaminated air enter the filter hopper 29 and then into the dust collecting chambers 14, 15, in which are placed sections 23, vertically arranged filter frame sleeves 24 with an external working surface. In this case, dust particles with a size of more than 150 μm are separated from the air in the collector 4, which acts as a dust collection chamber, and fall out in the filter hopper 29. Air dusted with small particles with sizes less than 150 microns enters the area of the filter bags 24. In this case, air passes through the fabric of the bags along their entire height and enters through the open part of the bags 24 into valve boxes 33. Since the bags 24 are made of glazed polyester, which doesn’t hold the dust layer on its working surface, then the dust flows from the sleeves and falls into the filter hopper 29, from which it is removed with a scraper chain conveyor 37 through the discharge opening and the sluice unloader 32 into the conveyor for a centrally dust collection part 86. A small dust remains inside the fabric filter sleeves. In the filtering mode (FIG. 5), the openings for purge air 19 are closed and the openings for purified air 20 are open. Therefore, the cleaned air from the valve boxes 33 enters the cleaned air chamber 9. In the filtering mode, the controlled air dampers 53, 56, 58 are open, and the air dampers 54, 55, 57 are closed. Therefore, the cleaned air in the sleeves containing wood particles with a size of less than 10 microns, from the chamber 9 passes sequentially through the open air damper 53, the chamber for additional dust collection 49, the panel 7 FAC, the chamber for additional purified air 10, the open air shutters 58 and 56 and goes into duct 42 output additional purified air. In the filtration mode, the controlled air damper 62 located on the secondary duct 60 is closed, and the air damper 63 located on the recirculation duct 12 is open. While the fire retardant valve 79 is open, and the fire retardant valve 80 is closed. Therefore, additionally purified air from the duct 42 by the main centrifugal fan 11 is fed through a recirculation duct 12 to the air distributor 13 installed in the workshop. Moreover, as a result of the fact that the inside of the sleeves is more rarefied than the outside of the sleeves by the amount of resistance of the equilibrium dusty fabric, the fabric, due to the presence of the core frame, is drawn into the sleeves, and the cross section of the sleeve looks like a socket, shown in Fig.6, section D- D. Sections 23 of the sleeves 24 will be in the filtering mode, the estimated time controlled by a time relay, after the triggering of which begins the regeneration of the sleeve sections. A filter with a three-stage air purification system with air purification coefficients in the intake manifold 4 (dust collecting chamber) η ₁ = 0.5, filtering sleeves η ₂ = 0.999, panel cell air filters of the type ФЯК η ₃ = 0.92 provides a total cleaning coefficient η _{1 , 2,3} = 1- (1-η ₁ ) (1-η ₂ ) (1-η ₃ ) = 1- (1-0.5) (1-0.999) (1-0.92) = 0, 99996 and the efficiency of stonecrop E _1,2,3 = 100η _1,2,3 = 99,996%.

Regeneration of sections of filter bags (cleaning critically dusty fabric of bags from dust to an equidistant state) is carried out sequentially by the method of reverse sectional purging of bags with cleaned air according to an individual cyclogram depending on the initial concentration of wood dust С _Н , mg / m ³ in front of the filter. For workshops of white grinding of plywood С _Н ≈3000 mg / m ³ , and for workshops of grinding plywood С _Н ≈6950 mg / m ³ . At the beginning of the regeneration of the sections of the sleeves, an additional centrifugal fan 38 is turned on, which draws air from the filter hopper 29 through the bag sections 23 involved in filtering and cleaning it. In the regeneration mode, an increased amount of air passes through the filter bags in comparison with the filtration mode, equal to L _Σ = L _AC + L _CR (where L _AC is the capacity of the main centrifugal fan 11 and L _CR is the capacity of the additional centrifugal fan 38 providing purge air). The air cleaned in the hoses with the fans 11, 38 enters the cleaned air chamber 9. The purge air in the amount of L _pr is supplied by the fan 38 through the duct 39 to the purge manifold 8, and the main part of the air in the amount of L _{AC by the} fan 11 is fed into the additional dust collection chamber 49 and further into a single-row panel of 7 air cell filters for additional air purification.

Next, the cycle of cleaning (purging) critically dusty section of the sleeves from dust accumulated in the filter cloth (Fig.2, 3), begins with the valve 16 of the valve box 33 is lowered to close the hole 20, thereby preventing air from leaving the section 23 sleeves 24 into the cleaned air chamber 9. The movement of the valve 16, which closes the hole 20, opens the hole 19, introducing a section of the sleeves in connection with the purge manifold 8. Since the pressure of the purge air is greater than the pressure outside the filter sleeves is dustproof the purge air, entering the sleeves, creates a dynamic air blow, as a result of which the sleeves of the section are inflated, and the dust accumulated in the fabric of the sleeves is blown out of the fabric and falls down, settling in the filter hopper 29. In this case, the cross section of the sleeve has the form depicted in figure 3 (section BB). As a result of this reversal of the pressure drop in the sleeves, the latter not only pass from the compressed state to the inflated state, but a reversible air flow is possible through the filter sleeves, which helps to remove dust particles accumulated inside the fabric. After a sufficient time interval (T = 10 ... 20 s) necessary for the dust removed from the filter sleeve to fall from the filter bags into the filter hopper 29, controlled by a time relay, the cleaning cycle is completed and the dust-free section of the bags switches to filtering by lifting the valve 16 in order to open the hole 20 and close the hole 19. Then, the cleaning cycle of the filter bags is sequentially carried out according to the described scheme in the remaining bag sections.

In Fig. 8, by means of the lower position of the valve 16 in one valve box 33 (the first on the left) and the upper position of the valves 16 in the other valve boxes 33, the second mode of operation of the filter is illustrated, in which one section of the sleeves (first on the left) is in the cleaning (purge) mode , and the remaining sections are in filtering mode. In the third mode - the main mode of regeneration of the panel 7 of the air filter cells FJK, which can be considered by example (Fig. 8), the work is carried out in the following sequence. The controlled air dampers 53, 56, 58, 63 are closed and the air dampers 54, 55, 57 and 62 are opened. In this case, the cleaned air is sucked in by the main centrifugal fan 11 from the chamber 9, passes through the open air dampers 54, 55, the chamber of the additional purified air 10 , two sections of the panel 7 of the air filter cells of the FCF and the open air damper 57, and enters the duct 42 output additional purified air. From the duct 42, additionally purified air is supplied by the fan 11 through the recirculation duct 12 and, with the air damper 63 closed, enters through the additional duct 60 to the filter hopper 29, from where it flows to the sections 23 of the filter bags 24 for cleaning, forming a recirculation circuit for the back-purge of the panel 7 of the air cell filters purified air in the intake mode of the main fan 11.

In the regeneration mode, the panel of air cell filters of the FYAK type operates: a scraper chain conveyor 37, a sluice unloader 32 and a closed chain conveyor 86 for moving dust to the storage hopper 87.

The reverse purge of the panel 7 FAC with purified air is carried out once a day. In this case, the dust mass M _P , kg accumulating in the FFK air filters is determined by the formula M _P = (C _nfyak- C _kfyak ) 10 ^-6 L _AC T (where C _nfyak , C _kfyak are the initial and final dust concentrations, respectively, before additional by cleaning and after additional air purification in the FFC panel, mg / m ³ ; T - duration of the filtering mode of the panel 7 FSC, h) At the same time, for the plywood grinding workshop at С _Н = 6950 mg / m ³ :

С _нфяк = C _H N _1,2 = С _Н (1-η _1,2 ) = 6950 · 0.0005 = 3.47 mg / m ³

C _kfyak = C _H N _1,2,3 = C _H (1-η _1,2,3 ) = 6950 · 0.00004 = 0.28 mg / m ³ .

Here: С _Н - initial dust concentration in front of the filter, mg / m ³ ; N, _1.2 ; N _1,2,3 - dust slip coefficients, respectively, with two-stage and three-stage air purification.

When L _AC = 74800 m ³ / h, the values of Mp, kg, will be:

- for 2-shift operation (T = 16 h)

M _P = (3.47-0.28) · 10 ^-6 · 74800 · 16 = 3.8 kg

- for 3-shift operation (T = 24 h)

M _P = (3.47-0.28) · 10 ^-6 · 74800 · 24 = 5.73 kg

а концентрация пыли в продувочном воздухе при V=6230 м³ составляет:The duration of the reverse purge can be taken equal to T = 5 min = 300 s. In this case, an air volume equal to

and the concentration of dust in the purge air at V = 6230 m ³ is:

With _n = M _n × 10 ³ / V = 5,73 · 10 ^3/6230 = 0.92 g / ^m3 <LEL = 12.6 g / m ³ (for wood dust).

From the above calculation, it follows that backwashing with purified air of the PFC panel is sufficient to be carried out once a day and for 5 minutes. In this case, the concentration of dust generated in the purge air is not explosive.

In the third mode of regeneration of the PFC panel, the purge rate will be

υ = L _AC / n _phac F _ph 3600 = 74800/30 · 3.8 · 3600 = 0.18 m / s.

In the fourth mode - forced mode of regeneration of the panel 7 of the air filter cells FJK, which can be considered by example (Fig. 8), the work is carried out in the following sequence. Initially, the controlled air flaps 54, 57 and 62 open, and the air flaps 53, 55, 56, 58 and 63 are closed. In this case, the cleaned air is taken in by the main centrifugal fan 11 from the chamber 9, passes through the open air damper 54, the chamber of the additional purified air 10, through the first section of the PFC panel 7, located to the left of the transverse partition 50, the additional dust collection chamber 49, the open air damper 57 and goes into the duct 42 output additionally purified air. From the duct 42, additionally cleaned air by the fan 11 is fed through a recirculation duct 12 and an additional duct 60 to the hopper part 29 of the filter and then to the filter sleeves 24. Then, in the same sequence, the second section of the panel 7 FAC located on the right side of the transverse partition 50. Time the purge of each section of the panel 7 FAC is 5 minutes The backflush speed of the FAC panel in the fourth mode is

υ = L _AC / _{0.5n phak} F _ph 3600 = 74800 / 0.5 · 30 · 3.8 · 3600 = 0.36 m / s.

When installing in the chamber of additionally purified air 10 two transverse partitions 50 dividing the panel into three sections of the FCF, the speed of the reverse purge of the FCF in the fourth mode will be

υ = L _AC / 0.333n _fak F _fak 3600 = 74800 / 0.333 · 30 · 3.8 · 3600 = 0.547 m / s.

In the fifth mode - spark detection in the supply pipe 3, illustrated in Fig.11, the filter mechanisms operate in the following order. An optical flame detector 67 detects the appearance of a spark in the inlet transport pipe 3 and sends an electrical signal through an amplifier 68 to the shutoff valve 71 to open it, the shutoff valve 73 to close, the main centrifugal fan 11 to turn off and turns on an audible signal to stop the operation of the machine equipment.

Valve 71 is actuated by an electric detonator. When the valve 71 is opened from the cylinder 70, a fire extinguishing agent such as ammonium phosphate is supplied into the pipeline 3 through the nozzle 72. In the cylinder, the extinguishing agent is under pressure of compressed nitrogen (1-1.2) · 10 ⁵ kPa. Getting into the pipeline with a combustible medium, the extinguishing agent inerts the unburned mixture and extinguishes the flame in the zone of operation of the spark arrester 69. After extinguishing the sparks in the transport pipeline 3, the inspection hatch 74 opens under spark arrester 69, the pipeline 3 is cleaned of combustion products, and then the inspection closes hatch 74, the shut-off valve 71 is closed and a new electric detonator is inserted into it, the empty cylinder is replaced with a new cylinder 70 with extinguishing agent, the shut-off valve opens The valve 73, the fan 11 and a sound signal permitting to proceed on the machine tools. In the sixth mode (ignition of the dusty air mixture directly in the filter), which can be considered using the example of Fig. 2, the filter mechanisms work automatically in the following sequence.

The fire sensor 75 detects an excess of the set temperature in the dust collection chambers 14, 15 of 69 ° C, at which dust can ignite, and sends an electric signal through an amplifier (not shown) to the shut-off valve 78 to open it, and the shut-off valve 73 installed on the inlet transport pipe 3 and the gate valve 31 to close them, as well as the shutdown signals: to the gate unloader 32, the unloader (chain scraper conveyor) 37 and the main centrifugal fan 11, and turns on the sound signal cash on the termination of the operation of machine equipment. Valve 78 is actuated by an electric detonator. When the valve 78 is opened, water is supplied to the dust collecting chambers 14, 15 through the manifold 76 with nozzles, which extinguishes the fire in the filter. As the temperature in the filter rises, the fuses in the fire-retardant valves 79, 80 installed at the exits of the tee 82 of the recirculation duct 12 are destroyed. At the same time, the fuse 79 closes, preventing the entry of fire into the air distributor 13, and the valve 80 opens, allowing air to flow through a hole 83 of the outlet 82 into the atmosphere (in Fig. 9, the direction of the airflow is shown by an arrow).

After extinguishing the fire, valve 78 closes, water is drained from the filter hopper 29 and the filter sleeves 24 and the FFB panel 7 are removed for drying and revision for further suitability.

In the seventh mode, a dust explosion, which can occur as a result of a probable failure of the dust prevention system in the bunker and the discharge of static electricity, an explosive wave forms, which opens the safety doors 84, destroying the locks, and spreads fire in the direction of the fire fuses 79, 80. through the opened doorways 84, air pressure is released from the filter, fire fuse 79 closes, and fire fuse 80 opens, releasing a dusty mixture into the atmosphere through the hole 83 in the branch 82, fire sensors 75 are activated, which include a fire extinguishing system, the action of which is described above.

All of the above, including a description of the operation of the filter, confirms the possibility of its use in industry with obtaining high technical performance compared with the known filter designs. In addition, both in the sources of patent and scientific and technical information, and in industry, such a design did not occur, which indicates that the proposed solution meets the criteria of the invention.

Claims (1)

Bag filter for three-stage air purification from mechanical impurities, containing a number of filter modules, each of which has two dust-collecting chambers installed with an interval between their side walls, equipped with perforated plates in the upper part and sections of vertically arranged frame filter sleeves, fixed with open top ends on perforated plates, inlet pipe of polluted air, collector of input of polluted air, at least, single-row and burn an area-mounted panel of cellular air filters of the type ФЯК, a purge air collector, chambers of cleaned and additionally cleaned air, a main centrifugal fan and a recirculation duct, valve boxes mounted on perforated plates with poppet type actuating valves that interact alternately with two coaxial openings for purge and purified air located on the horizontal axis of the purge air collector one above the other in each th valve box, and two mirrored boxes of one module have a common partition separating their pairs of coaxial openings, a sealed service chamber mounted on the valve boxes, a hopper mounted under the dust collection chambers and having an unloading device with a sluice unloader, in addition, the filter contains an additional a centrifugal fan, the suction pipe of which is connected by an air duct to the hole in the end of the purified air chamber, and the discharge pipe to the inlet a purge manifold, and a collector for outputting additionally purified air protruding beyond the filter modules, connected at the outlet by an air duct to the suction pipe of the main centrifugal fan, characterized in that a T-shaped partition is installed in the chamber of the cleaned air between the dust collecting chambers under the valve openings of the cleaned air, having a horizontal platform and a vertical wall lowered down, on one side of which, with connection to its free end, non-cellular air filters of the type FYAK equipped with wire frames to form an additional dust collection chamber below and to place additional purified air on top of the camera panel, in which at least one transverse partition is installed between the horizontal platform and the air filter cell panel, dividing the panel into two sections, in addition, at the inlet and outlet of the chambers of additional dust collection and additionally purified air and in the transverse partition installed insp access hatches having openings with flanged nozzles to which controlled air dampers are attached, which additionally provide, together with the main centrifugal fan, the main and forced modes of regeneration of the air cell filter panel by back-flushing with purified air in the suction mode, while the collector for the output of additional purified air is installed with coverage of inspection hatches with controlled air dampers located at the outlet of the chambers of additionally cleaned air ha and additional dust collection, the recirculation air duct is equipped with a tee with an additional air duct that is connected to the hole in the filter hopper, and on the additional and recirculation air ducts at the outlets of the tee, as well as on the supply pipe of contaminated air in front of the filter, controlled air dampers are installed, which ensure the return of the polluted purge air into the filter hopper and its supply to the filter bags in the suction mode according to the recirculation scheme.

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